diff --git a/openair1/SIMULATION/LTE_PHY/dlsim.c b/openair1/SIMULATION/LTE_PHY/dlsim.c
index 81ef02f2336a83c64375bafb7b999af448f21c22..7240e5d627f92dfcd312fda5fd85a2883f0f0479 100644
--- a/openair1/SIMULATION/LTE_PHY/dlsim.c
+++ b/openair1/SIMULATION/LTE_PHY/dlsim.c
@@ -662,9 +662,11 @@ int main(int argc, char **argv) {
     hostname[1023] = '\0';
     gethostname(hostname, 1023);
     printf("Hostname: %s\n", hostname);
-    sprintf(time_meas_fname,"%s/SIMU/USER/pre-ci-logs-%s/time_meas_prb%d_mcs%d_anttx%d_antrx%d_pdcch%d_channel%s_tx%d.csv",
-	    getenv("OPENAIR_TARGETS"),hostname,
-	    N_RB_DL,mcs,n_tx,n_rx,num_pdcch_symbols,channel_model_input,transmission_mode);
+    char dirname[FILENAME_MAX];
+    sprintf(dirname, "%s/SIMU/USER/pre-ci-logs-%s", getenv("OPENAIR_TARGETS"),hostname ); 
+    sprintf(time_meas_fname,"%s/time_meas_prb%d_mcs%d_anttx%d_antrx%d_pdcch%d_channel%s_tx%d.csv",
+	    dirname,N_RB_DL,mcs,n_tx,n_rx,num_pdcch_symbols,channel_model_input,transmission_mode);
+    mkdir(dirname,0777); 
     time_meas_fd = fopen(time_meas_fname,"w");
   }
   
diff --git a/openair1/SIMULATION/LTE_PHY/ulsim.c b/openair1/SIMULATION/LTE_PHY/ulsim.c
index 1dd6ee59b0eea7fb42b7cbceeee6aa25d8143403..90aa5856ef25e56414827bde7a7b3a718f7ae27c 100644
--- a/openair1/SIMULATION/LTE_PHY/ulsim.c
+++ b/openair1/SIMULATION/LTE_PHY/ulsim.c
@@ -521,8 +521,11 @@ int main(int argc, char **argv) {
     hostname[1023] = '\0';
     gethostname(hostname, 1023);
     printf("Hostname: %s\n", hostname);
-    sprintf(time_meas_fname,"%s//SIMU/USER/pre-ci-logs-%s/time_meas_prb%d_mcs%d_antrx%d_channel%s_tx%d.csv",
-	    getenv("OPENAIR_TARGETS"),hostname,
+    char dirname[FILENAME_MAX];
+    sprintf(dirname, "%s//SIMU/USER/pre-ci-logs-%s", getenv("OPENAIR_TARGETS"),hostname);
+    mkdir(dirname, 0777);
+    sprintf(time_meas_fname,"%s/time_meas_prb%d_mcs%d_antrx%d_channel%s_tx%d.csv",
+	    dirname,
 	    N_RB_DL,mcs,n_rx,channel_model_input,transmission_mode);
     time_meas_fd = fopen(time_meas_fname,"w");
   }